Text Book Of Mechanical Engineering

Compound Locomotive.

689

horseshoe bearings have water passing in'and out at j j. K K are
lifting eyes.

The Stern Tube, Fig. 673. A is the tail shaft, tapered to fit
the propeller, where it is keyed and gripped by a nut and split
cotter. A renewable muntz-metal sheathing D is rolled on the
shaft, and gives a smooth, non-corrosive working surface. The
tube B, bolted to the water-tight bulkheads at H H, and supported
by the stern frame at c, has a bush E in which are placed staves
of hard wood (Hgmim vita), being the best bearing where water
is the lubricant. At the other end a stuffing-box, formed by the
neck ring F and gland G, prevents water entering the tube.

Compound Locomotive.—The general arrangement of a
locomotive being well known, one good typical example will here
suffice. The example chosen serves to illustrate the ordinary
'inside cylinder7 engine, having cylinders within the frame, the
only main difference being the arrangement of steam pipes. It
also shews one of the most successful adaptations of the com-
pound principle to locomotives.

Figs. 675-6-7, Plate XVIII, are views of a Compound
Express Locomotive for the North-Eastern Railway, on the
'Worsdell and Von Borrie' principle. The main frame consists
of two plates LL, a cross stay Lt, and buffer beams MM: the front
beam carrying the buffers N N, draw hook b, and coupling screw c,
while the back beam faces that of the tender Q. Between M
and Q are placed buffers p, pivot 50, and safety links 88, the pull
being taken by the draw-bar 6. 35 is the foot-plate, 19 the cab,
to shield from the weather, 34 the platform, and y the splasher for
the driving wheel: //"are lamp brackets, and dd lifeguards. The
cylinders A and B are bolted between the frame plates, and slide
calves aal are placed above the cylinders to suit Joy gear, whose
various links z, Y, x, and w are explained at Fig. 640. There are
four slide bars qq to each cylinder, and two motion blocks rr\
n and/ are the piston rods, and mm the connecting rods. The
wdgh-bar shaft s is moved by a hand-wheel and screw at 0,
coupled to lever / by the rod u. E E are the driving wheels, and
F F the trailing wheels, with j and K the respective axles : the
former is known as the crank axle, and in the N.E.R. example is
turned throughout The wheel centres are of cast steel, but the